/**
 * author: Di (微信小程序开发工程师)
 * organization: WeAppDev(微信小程序开发论坛)(http://weappdev.com)
 *               垂直微信小程序开发交流社区
 * 
 * github地址: https://github.com/icindy/wxParse
 * 
 * for: 微信小程序富文本解析
 * detail : http://weappdev.com/t/wxparse-alpha0-1-html-markdown/184
 */

/**
 * utils函数引入
 **/
import showdown from './showdown.js';
import HtmlToJson from './html2json.js';
/**
 * 配置及公有属性
 **/
var realWindowWidth = 0;
var realWindowHeight = 0;
wx.getSystemInfo({
    success: function (res) {
        realWindowWidth = res.windowWidth
        realWindowHeight = res.windowHeight
    }
})
/**
 * 主函数入口区
 **/
function wxParse(bindName = 'wxParseData', type='html', data='<div class="color:red;">数据不能为空</div>', target,imagePadding) {
    var that = target;
    var transData = {}; //存放转化后的数据
    console.log(data,'-----------')
    if (type == 'html') {
        transData = HtmlToJson.html2json(data, bindName);
    } else if (type == 'md' || type == 'markdown') {
        var converter = new showdown.Converter();
        var html = converter.makeHtml(data);
        transData = HtmlToJson.html2json(html, bindName);
    }
    transData.view = {};
    transData.view.imagePadding = 0;
    if(typeof(imagePadding) != 'undefined'){
        transData.view.imagePadding = imagePadding
    }
    var bindData = {};
    bindData[bindName] = transData;
    that.setData(bindData)
    that.wxParseImgLoad = wxParseImgLoad;
    that.wxParseImgTap = wxParseImgTap;
}

// 图片点击事件
function wxParseImgTap(e) {
    var that = this;
    var nowImgUrl = e.target.dataset.src;
    var tagFrom = e.target.dataset.from;
    if (typeof (tagFrom) != 'undefined' && tagFrom.length > 0) {
        wx.previewImage({
            current: nowImgUrl, // 当前显示图片的http链接
            urls: that.data[tagFrom].imageUrls // 需要预览的图片http链接列表
        })
    }
}

/**
 * 图片视觉宽高计算函数区 
 **/
function wxParseImgLoad(e) {
  var that = this;
  var tagFrom = e.target.dataset.from;
  var idx = e.target.dataset.idx;
  if (typeof (tagFrom) != 'undefined' && tagFrom.length > 0) {
    calMoreImageInfo(e, idx, that, tagFrom)
  } 
}

// 假循环获取计算图片视觉最佳宽高
function calMoreImageInfo(e, idx, that, bindName) {
    var temData = that.data[bindName];
    if (!temData || temData.images.length == 0) {
        return;
    }
    var temImages = temData.images;
    //因为无法获取view宽度 需要自定义padding进行计算，稍后处理
    var recal = wxAutoImageCal(e.detail.width, e.detail.height,that,bindName); 
    // temImages[idx].width = recal.imageWidth;
    // temImages[idx].height = recal.imageheight; 
    // temData.images = temImages;
    // var bindData = {};
    // bindData[bindName] = temData;
    // that.setData(bindData);
    var index = temImages[idx].index
    var key = `${bindName}`
    for (var i of index.split('.')) key+=`.nodes[${i}]`
    var keyW = key + '.width'
    var keyH = key + '.height'
    that.setData({
        [keyW]: recal.imageWidth,
        [keyH]: recal.imageheight,
    })
}

// 计算视觉优先的图片宽高
function wxAutoImageCal(originalWidth, originalHeight,that,bindName) {
    //获取图片的原始长宽
    var windowWidth = 0, windowHeight = 0;
    var autoWidth = 0, autoHeight = 0;
    var results = {};
    var padding = that.data[bindName].view.imagePadding;
    windowWidth = realWindowWidth-2*padding;
    windowHeight = realWindowHeight;
    //判断按照那种方式进行缩放
    // console.log("windowWidth" + windowWidth);
    if (originalWidth > windowWidth) {//在图片width大于手机屏幕width时候
        autoWidth = windowWidth;
        // console.log("autoWidth" + autoWidth);
        autoHeight = (autoWidth * originalHeight) / originalWidth;
        // console.log("autoHeight" + autoHeight);
        results.imageWidth = autoWidth;
        results.imageheight = autoHeight;
    } else {//否则展示原来的数据
        results.imageWidth = originalWidth;
        results.imageheight = originalHeight;
    }
    return results;
}

function wxParseTemArray(temArrayName,bindNameReg,total,that){
    var array = [];
    var temData = that.data;
    var obj = null;
    for(var i = 0; i < total; i++){
        var simArr = temData[bindNameReg+i].nodes;
        array.push(simArr);
    }
    temArrayName = temArrayName || 'wxParseTemArray';
    obj = JSON.parse('{"'+ temArrayName +'":""}');
    obj[temArrayName] = array;
    that.setData(obj);
}

/**
 * 配置emojis
 * 
 */
function emojisInit(reg='',baseSrc="/wxParse/emojis/",emojis){
    HtmlToJson.emojisInit(reg,baseSrc,emojis);
}

module.exports = {
    wxParse: wxParse,
    wxParseTemArray:wxParseTemArray,
    emojisInit:emojisInit
}
